how much boost are you planning to run? Since you have so many miles,you might think about an engine swap? Or just replace almost everything in the eninge since it has 107k miles. Search and you will find answers, i hate beaing told that but it works. I read about alot of stuff just by searching. I would got 9.5:1 as the highest unles you are planning to run low boost. If you plan to run 12 or around ther, go to 8:1. Hope it helps